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### Question: Who is at highest risk for Eisenmenger%27s syndrome ?
### Response: Like most congenital heart defects, it is unclear exactly why certain babies are born with Eisenmenger's syndrome. There is evidence to suggest that families with a history of genetic problems and other congenital heart disease may be at an increased risk for carrying and expressing the trait. Genetic testing may be performed to assist you in estimating the likelihood that any future children may be born with Eisenmenger's syndrome.
During pregnancy, expectant mothers exposed to rubella may have an increased risk in having a baby with a heart defect. Drug and alcohol exposure during pregnancy can also harm the fetus during development and result in potential birth defects.